A channel is much closer to a pipe. There are producers and consumers and these 
are typically different threads of execution unless you have an event based 
(async) system - that is not Go. 

> On Dec 6, 2019, at 9:30 AM, Egon Kocjan <ekoc...@gmail.com> wrote:
> 
> 
> There are goroutines in the examples of course, just a single goroutine per 
> bidi channel seems hard. By contrast, I've worked with actor systems before 
> and they are perfectly fine with a single fiber.
> 
>> On Friday, December 6, 2019 at 3:38:20 PM UTC+1, Robert Engels wrote:
>> Channels are designed to be used with multiple go routines - if you’re not 
>> you are doing something wrong. 
>> 
>>>> On Dec 6, 2019, at 8:32 AM, Egon Kocjan <eko...@gmail.com> wrote:
>>>> 
>>> 
>>> Hello
>>> 
>>> I'm preparing a short talk about Go channels and select. More specifically, 
>>> I want to show what not to do. I chose a bidirectional communication 
>>> channel implementation, because it seems to be a common base for a lot of 
>>> problems but hard to implement correctly without using any extra 
>>> goroutines. All the code is here: https://github.com/egonk/chandemo
>>> 
>>> 1_1.go: easy with en extra goroutine (takes 1.2s for million ints)
>>> 2_1.go: nice but completely wrong
>>> 2_2.go: better but still deadlocks
>>> 2_3.go: correct but ugly and slow (takes more than 2s for million ints)
>>> 2_4.go: correct and a bit faster but still ugly (1.8s for million ints)
>>> 
>>> So my question: is there a better way of doing it with just nested for and 
>>> select and no goroutines? Basically, what would 2_5.go look like?
>>> 
>>> Thank you
>>> Egon
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